lò vi sóng sharp r209 thai lan

... network concepts mea-It is the purpose of this chapter to describe various network concepts and provideequations that are useful for the analysis of filter networks Most RF/microwave filters and ... ␻t+␾) ) = Re(V1e j ␻t) (2.2) 7 Microstrip Filters for RF/Microwave Applications Jia-Sheng Hong, M J Lancaster Copyright © 2001 John Wiley & Sons, Inc ISBNs: 0-471-38877-7 (Hardback); 0-471-22161-9 ... The ABCD parameters are very useful for analysis of a complex two-port net-work that may be divided into two or more cascaded subnetnet-works Figure 2.2 gives the ABCD parameters of some useful

Ngày tải lên: 24/10/2013, 16:15

... Ensemble Planar EM simulator Harmonica Linear and nonlinear simulation Zeland Software IE3D Planar and 3D EM simulation and Optimization package Jansen Microwave Unisym/Sfpmic 3D planar EM simulation ... 3D planar EM simulation Sonnet Software em 3D planar EM simulation emvu Current display Applied Wave Research (AWR) Microwave Office Integrated package (including a linear simulator, 3D planar ... computer optimization The in- 273 Microstrip Filters for RF/Microwave Applications Jia-Sheng Hong, M J Lancaster Copyright © 2001 John Wiley & Sons, Inc ISBNs: 0-471-38877-7 (Hardback); 0-471-22161-9

Ngày tải lên: 15/12/2013, 06:15

... even without the via hole grounding Thus, it would seem that the voltageand current distributions would not change much in the vicinity of the midband fre-quency, even though the via holes are removed ... the other end The short-circuit connection onthe microstrip is usually realized by a via hole to the ground plane Since thegrounded ends are at the same potential, they may be so connected, without ... magnetic wall into the plane of symmetry, as indicated in Figure 11.1(a) without affecting the original fields Hence the parameters, namely, C, the capaci- dielectric layer ground plane Wf lfεr sfmagnetic

Ngày tải lên: 15/12/2013, 06:15

... on-boardelectronics before transmitting it back The gravitational force needs to be balancedsomehow if this object is to stay in position An orbital motion provides thisbalancing force If a satellite is placed ... location Two services are available:the standard positioning service (SPS) for civilian use, utilizing a single frequencycourse=acquisition (C=A) code, and the precise positioning service (PPS) for ... This chapter begins with an overview of microwave communication systems and the radio frequency wireless services toillustrate the applications of circuits and devices that are described in the

Ngày tải lên: 15/12/2013, 11:15

... as follows,Vinˆ vinejf and Vref ˆ vrefejj the line voltage, in time domain, can be evaluated as follows: v…z; t† ˆ Re‰V…z†ejotŠ ˆ Re‰Vine …a‡jb†zejot‡ Vrefe‡…a‡jb†zejotŠor, v…z; t† ˆ vine azcos…ot ... 70:71€ 99:86VAlternatively, V…z† ˆ Vine jbz‡ Vrefejbzˆ Vin…e jbz‡ Gejbz†where Vin is incident voltage at z ˆ 0 while G is the input re¯ection coef®cient Vinˆ 50 V€ 0 and, G ˆ19:21 ‡ j3:52 5019:21 ... 12Assume that Vin and Vref are the incident and re¯ected phasor voltages,respectively, at antenna A Therefore, the current, IA, through this antenna isIAˆ …Vin Vref†=Zoˆ 1:5€ 0A ) Vin Vref ˆ ZoIAˆ

Ngày tải lên: 15/12/2013, 11:15

... follows: Vo… jo† ˆjoL Vi… jo† 1joRC‡ 1 1 ‡ j 1o or, Vo… jo† ˆ Vi… jo† 1 ‡ jRC o o2 1o The quality factor, Q,of the resonant circuit is a measure of its frequency selectivity It is de®ned as follows ... this circuit has a zero at the origin of the complexs-plane and also it has two poles The location of these poles can be determined bysolving the following quadratic equation Figure 4.1 A series ... volt that is turned on at time t ˆ 0 If it represents input voltage vin…t†then the corresponding output vo…t† can be determined via Laplace transformtechnique.The Laplace transform of a unit step

Ngày tải lên: 15/12/2013, 11:15

... on the upper scale of the Smith chart Moving from thispoint toward the load (that is counterclockwise), open-circuit admittance(zero) is found ®rst Moving further in the same direction, the short-circuitadmittance ... theload A matching element can be placed at either one of these points 4 If the admittance in the previous step is 1 ‡ j B, then a susceptance of j B inshunt is needed for matching This can be a ... at 0.0353 l from theload In order to obtain a matched condition, the stub at this point must provide anormalized susceptance of j1:2748 Hence, `sˆ1bcot 1…1:2748† ˆ 0:1059 lThus, there are two

Ngày tải lên: 15/12/2013, 11:15

... can meet suchrequirements The chapter begins with the single-section impedance transformerthat provides perfect matching at a single frequency Matching bandwidth can beincreased at the cost of a ... bandwidth isachieved with an increased number of quarter-wave sections Chebyshev transfor-mers can provide even wider bandwidth with the same number of sections but there¯ection coef®cient exhibits ... linetapers The chapter concludes with a brief discussion on the Bode-Fano constraints,which provide an insight into the trade-off between the bandwidth and allowedre¯ection coef®cient 189 Radio-Frequency

Ngày tải lên: 15/12/2013, 11:15

... vào nồi, đậy nắp, nấu 3 – 4’, High - Cắt đôi bắp cải, rới dầu, gói lại (bằng plastic) Nấu trong lò 2’30” – 3’, high Sau khi nấu, vảy ráo nớc để tránh bắp cải bị mất màu - Cho nớc sốt vào nồi, ... đĩa, nấm để ở giữa, đổ sốt nòng vào giữa, dùng ngay -Long mustard with meatballs – Cải cay thịt viên Thành phần: - 200 g thịt lợn xay - 10 cái nấm - 2 lát gừng - 300 g cọng cải cay 15 ml dầu - ... phê dầu vừng - 1/2 thìa canh bột ngô, tiêu vừa đủ Cách làm: - Trộn thịt xay với gia vị, nặn thành viên, đậy nắp, nấu 2’20”, High - Cắt bỏ lá cải, cọng cắt miếng - Ngâm cải vào 800ml nớc và sô đa

Ngày tải lên: 23/12/2013, 05:17

... nhánh cỏ chanh (lemon grass) - 2 điều hoặc hạnh nhân xay nhỏ - 5 pcs ớt khô - 15g nghệ - 20g galangal - 12g tỏi - 8 g bột tôm Cách làm: - Trộn đều (A) - Thêm hành tây và dầu vào nồi Nấu không ... quả trứng - dầu Cách làm: Trang 10- Đập từng quả trứng vào từng khay nhỏ đã đợc bôi dầu.- Chọc lòng đỏ bằng tăm vài lần - Đậy bằng plastic, nấu Medium Low 8 – 10’ Nếu nấu ít hơn 4 quả, xem bảng

Ngày tải lên: 23/12/2013, 05:17

... Hence, V1 ˆ Vin ‡ Vin eÀ2g` V2 ˆ 2 Vin eÀg` I1 ˆ Vin …1 À eÀ2g` † Zo and, I2 ˆ 0 Now, from (7.4.6) and (7.4.7),... ith port as follows: Vi ˆ Viin ‡ Viref …7:6:9† and, Ii ˆ 1 …V in À Viref † Zoi ... voltage reaching port-1 is ÀVin eÀ2g` Hence, V1 ˆ Vin À Vin eÀ2g` V2 ˆ 0 I1 ˆ Vin …1 ‡ eÀ2g` † Zo and, I2 ˆ À 2Vin Àg` e Zo Therefore, Y11 Vin  …1... has a short circuit If Vin is incident voltage ... reaching port-1 is ÀVin eÀ2g` Hence, V1 ˆ Vin À Vin eÀ2g` V2 ˆ 0 I1 ˆ Vin …1 ‡ eÀ2g` † Zo and, I2 ˆ À 2Vin Àg` e Zo Therefore,... circuit while the source is still connected at port-1 If Vin is incident

Ngày tải lên: 24/12/2013, 17:15

... algebraic equations as follows: ViˆPNjˆ1ZijIj i ˆ 1; 2; ; N …9:1† This says that the effect Viat the ith port is a sum of gain times causes at its N ports.Hence, Vi represents the dependent variable ... arrows  Signal Iktraveling along a branch that connects nodes Viand Ikis multiplied bythe branch-gain Zik Dependent node (effect) Vi is equal to the sum of thebranch gain times corresponding independent ... terminal voltage VScan be found Vref S ˆ Zo Zo‡ ZSES Zo ZS Zo‡ ZSVSinDividing it byp2Zo,we ®nd that Vref S Zo‡ ZS Vin S  2Zop Figure 9.16 Incident and re¯ected waves at the output

Ngày tải lên: 24/12/2013, 17:15

... blocks of an electronic system Whilevacuum tube devices are still used in high-power microwave circuits, transistorsÐsilicon bipolar junction devices, GaAs MESFET, heterojunction bipolar transistors(HBT), ... values of load or source impedance) if one or both of these conditions areviolated It means that the transistor can provide stable operation for a restrictedrange of GS and GL A simple procedure ... 0:044 l can provide thedesired admittance This circuit is illustrated in Figure 10.11 Trang 24The return-loss is found by expressing jGinj in dB SinceGinˆ S11‡ S12S21GL 1 S22GLand S12 ˆ 0, Ginˆ

Ngày tải lên: 24/12/2013, 17:15

... nonlinear active device In addition, since thedevice is producing RF power, it must have a negative resistance The basic principle of an oscillator circuit can be explained via a linear feedbacksystem ... 0…11:1:11† Trang 5If output impedance of the device is very high then Yo is approximately zero Inthis case, (11.1.11) can be simpli®ed further For a nontrivial solution, thedeterminant of its coef®cient ... hyperabrupt junctions Abruptjunction diodes provide very high Q and also operate over a very wide tuning voltagerange (typically, 0 to 60 V) These diodes provide an excellent phase noiseperformance

Ngày tải lên: 24/12/2013, 17:15

... normalized values 2 Moving away from the load (i.e., toward the generator) corresponds tomoving in a clockwise direction 3 A complete revolution around the chart is made by moving a distance 4 The ... the previous sections, the calculations normally involvecomplex numbers that can be complicated and time consuming The use of theSmith chart avoids the tedious computation It also provides a ... 0.6 A circle centered at the origin is a constant jG…x†j circle 7 Moving along the lossless transmission line is equivalent to moving along theconstant jG…x†j circle circuit For admittance reading,

Ngày tải lên: 24/12/2013, 17:15

... components used in systems to combine or divide signals.They are commonly used in antenna feeds, frequency discriminators, balancedmixers, modulators, balanced amplifiers, phase shifters, monopulse ... capacitances Active filters can be built by using active devices such as MESFETs in microwave frequencies and CMOS in RF The active devices provide negative resistance and compensate for the losses ... commonly used to fabricate these devices and the MMICs, since the electron mobility in GaAs ishigher than that in silicon Higher electron mobility means that the device canoperate at higher frequencies

Ngày tải lên: 24/12/2013, 17:15

... toheating of a solid-state device Some of these characteristics can be found in an example given in Table 6.1 6.2 TRANSMITTER NOISE Since the oscillator is a nonlinear device, the noise voltages ... high-Qcircuits to build the oscillators (examples are waveguide cavities, dielectric resona-tors, or superconducting resonators=cavities); (2) temperature compensation circuits; or (3) phase-locked ... receiver to form a transceiver In this case, a duplexer is used toseparate the transmitting and receiving signals The duplexer could be a switch, acirculator, or a diplexer, as described in Chapter

Ngày tải lên: 21/01/2014, 23:20

... information in a complex environment A sophisticated radar is required to search, detect, and track multiple targets in ahostile environment; to identify the target from land and sea clutter; and ... widely used by the military for surveillance andweapon control However, increasing civil applications have been seen in the past 20years for traffic control and navigation of aircraft, ships, and automobiles, ... radar or bistatic radar Monostatic radaruses a single antenna serving as a transmitting and receiving antenna Thetransmitting and receiving signals are separated by a duplexer Bistatic radar usesFIGURE

Ngày tải lên: 21/01/2014, 23:20

... are radio=wireless services between mobile and landstations or between mobile stations Mobile communication systems includemaritime mobile service, public safety systems, land transportation systems,industrial ... ofstations provided a multiple-access technique is used Frequency division multipleaccess (FDMA) will distribute links established at the same time among differentfrequencies Time division multiple ... Frequency(GHz) Downlink Frequency(GHz) Trang 18include police, fire, ambulance, highway, forestry, and emergency services Landtransportation systems cover the communications used by taxis, buses,

Ngày tải lên: 21/01/2014, 23:20

... the output of a mixer A nonlinear device can be used to accomplish the amplitude modulation Figure 9.4 shows examples using a modulated amplifier and a balanced diode modulator FIGURE 9.3 Degrees ... characteristics of a balanced frequency 9.3 FREQUENCY MODULATION 279 Trang 7discriminator The circuit consists of a frequency-to-voltage converter and an envelope detector The balanced frequency-to-voltage ... digital cellular time division multiple access (TDMA) radio standard; it has high power efficiency and spectral efficiency In power-efficient, nonlinearly amplified (NLA) environments, where fully

Ngày tải lên: 21/01/2014, 23:20